Malkiel’s story centers on the "Efficient Market Hypothesis." He argues that stock prices move in a "random walk"—not because they are chaotic, but because they are so efficient at absorbing new information that no one can consistently predict the next move [3, 4, 7]. To Malkiel, trying to "beat the market" through technical analysis (reading charts) or fundamental analysis (picking "undervalued" stocks) was largely a fool’s errand [4]. The Evolution of the Walk
He analyzed the tulip-mania-like behavior of the dot-com era and the 2008 financial crisis, proving that while markets are generally efficient, human psychology—fear and greed—can still create massive "Castles in the Air" [1, 4]. A Random Walk Down Wall Street: The Time-Tested...
Long before ETFs were a household term, Malkiel was a vocal advocate for low-cost index funds, arguing that if you can’t beat the market, you should be the market [3, 4]. Long before ETFs were a household term, Malkiel